I have my Calibre library on my PC and my Surface tablet. The main library is in Dropbox and I use FreeFileSync for syncing. I also keep several back-up copies and regularly run Library Maintenance, just in case. Sometimes Dropbox makes conflicted copies of a few files (mostly the database file) and that must be fixed asap. OneDrive had the same problem when I still used it. I always have the syncing stopped while Calibre is open, so I have no idea why these conflicted copies happen. But it's a minor annoyance if you check regularly.
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